CODEWITHSUNDEEP
node.jsmongodbmongoose
chovy
chovy

Reputation: 75854

sharing db connection across entire app in mongoose

With the latest mongoose update, you can no longer user models the way I've been doing. I need to share the same db connection across my entire app.

https://github.com/LearnBoost/mongoose/issues/1249

Here is the old way which no longer works:

./models/user.js

var mongoose = require('mongoose'), cfg = require('../config')
, Schema = mongoose.Schema
, db = mongoose.createConnection(cfg.mongo.uri, cfg.mongo.db);
...

module.exports = db.model('Item', ItemSchema);

How can I re-use db connection as suggested in github issue above?

I'm using var User = require('./models/user'); in several different places in my code base.

Upvotes: 2

Views: 2389

Answers (1)

David Weldon
David Weldon

Reputation: 64342

Option 1: Use a shared object

My model code looks similar, but instead of repeatedly requiring the modules I just require them once when the application starts and then assign the results to a shared object. For example if you are using an express app you could just so something like app.locals.models.User = require('./models/user');. Then anything with access to the app can see your models without needing a require.

Option 2: Ensure a single modification in the exported function

You can define your user module like so:

var mongoose = require('mongoose');

var userSchema = new mongoose.Schema({name: String});

var User = null;

module.exports = function(db) {
  if (db && User === null) {
    User = db.model('User', userSchema);
  }
  return User;
};

When you start your application you simply need to: require('./models/user')(db). Subsequent requires by other modules in your application can drop the db paramater, as User will only be set once.

Upvotes: 9

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